So I bought a used MBP through a friend and on the about this Mac it says it is an early 2011 and shows specs but when I punch the serial number (matches on the bottom and in the about this Mac) it comes up as a 2009 model. I haven't found anything about this but I did hear it is possible to change the about this Mac to show a newer model when it is an actual model. Anyway I'm hoping someone can confirm this. The memory and everything fits the 2009 model.

Weird that the About This Mac would say a different model.
At least back in the Snow Leopard days, you could edit a system .plist file and say you were running a different version of OS X than you actually were.

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